Pain really low/ lightning crotch?

I have a weird and strong pain really low. If I sit for too long at work or go from sitting to standing I feel a sharp pain very low. It feels like a mix of nerves and bone. It can last for 1 minute or if I am moving/ waking around it can last for an hour. The only way I don’t feel it is if I lay down. It has been on an off all day for the last few days. Is this normal? Did he just move low and is putting pressure down low? I am a FTM at 33 weeks so I feel stupid calling the doctor if it’s normal but it just feel so intense at times that it hurts to walk or move or sit. I have tried to workout but I can’t make it through a workout. I have tried to stretch but it doesn’t so much. Any advice?